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CVE PROGRAM SOURCE RECORD6.5 Medium

CVE-2021-31363

Junos OS and Junos OS Evolved: Receipt of a specific LDP message will cause a Denial of Service

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Status
Published
Published
Updated
Assigning organization
juniper

Description

In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Juniper Networks Junos OS

  • unspecified to < 19.2R2unaffected
  • 19.2R2 to < 19.2*affected
  • 19.3 to < 19.3R2-S6, 19.3R3-S2affected
  • 19.4 to < 19.4R1-S4, 19.4R2-S4, 19.4R3-S2affected
  • 20.1 to < 20.1R2-S1, 20.1R3affected
  • 20.2 to < 20.2R2-S1, 20.2R3affected
  • 20.3 to < 20.3R1-S2, 20.3R2affected

Juniper Networks Junos OS Evolved

  • unspecified to < 20.1R2-S3-EVOaffected
  • 20.3 to < 20.3R1-S2-EVOaffected

References